Add ID endpoint

Author: renke

app/src/main/java/de/openknowledge/workshop/cloud/controllers/AppController.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) open knowledge GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ */
+package de.openknowledge.workshop.cloud.controllers;
+
+import org.springframework.http.MediaType;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.UUID;
+import java.util.logging.Logger;
+
+@RestController
+@RequestMapping("/")
+public class AppController {
+    private static final String RANDOM_UUID = UUID.randomUUID().toString();
+
+    private static final Logger LOGGER = Logger.getLogger(
+        AppController.class.getSimpleName()
+    );
+
+    @GetMapping(value = "id", produces = MediaType.APPLICATION_JSON_VALUE)
+    public String getId() {
+        LOGGER.info("RESTful call 'GET id'");
+
+        return RANDOM_UUID;
+    }
+}